We study competitive positioning and pricing strategies in markets with negative consumption externalities. Negative consumption externality is modeled as a decrease in preference for a product as more consumers purchase the same product. Using a two stage Hotelling type model, we show that a cost leader prices higher than the cost disadvantaged firm when the magnitude of negative consumption externality in the market is below a threshold otherwise the cost leader prices lower than the cost disadvantaged firm. Also, increase in population density decreases price differential between the cost leader and the cost disadvantaged firm.